首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   527篇
  免费   18篇
  国内免费   9篇
耳鼻咽喉   1篇
儿科学   43篇
妇产科学   9篇
基础医学   50篇
口腔科学   9篇
临床医学   46篇
内科学   159篇
皮肤病学   10篇
神经病学   3篇
特种医学   131篇
外科学   19篇
综合类   10篇
预防医学   12篇
眼科学   2篇
药学   24篇
  1篇
中国医学   6篇
肿瘤学   19篇
  2022年   3篇
  2021年   4篇
  2018年   5篇
  2017年   4篇
  2016年   4篇
  2015年   6篇
  2014年   11篇
  2013年   12篇
  2012年   9篇
  2011年   6篇
  2010年   23篇
  2009年   21篇
  2008年   14篇
  2007年   17篇
  2006年   15篇
  2005年   3篇
  2004年   3篇
  2003年   8篇
  2002年   3篇
  2001年   14篇
  2000年   8篇
  1999年   8篇
  1998年   27篇
  1997年   28篇
  1996年   40篇
  1995年   36篇
  1994年   34篇
  1993年   18篇
  1992年   2篇
  1991年   11篇
  1990年   4篇
  1989年   18篇
  1988年   23篇
  1987年   16篇
  1986年   14篇
  1985年   14篇
  1984年   10篇
  1983年   8篇
  1982年   6篇
  1981年   7篇
  1980年   9篇
  1979年   2篇
  1978年   3篇
  1977年   7篇
  1976年   5篇
  1975年   4篇
  1973年   2篇
  1970年   1篇
  1965年   1篇
  1959年   1篇
排序方式: 共有554条查询结果,搜索用时 49 毫秒
91.
Rubesin  SE; Kennedy  M; Levine  MS; Rosato  EF; Laufer  I 《Radiology》1988,167(2):345-347
Eccentric ballooning of the distal esophagus was observed radiographically in 11 of 23 patients (48%) who underwent Heller myotomy for achalasia. While, to the authors' knowledge, ballooning at the site of myotomy incision has not been described previously in the radiologic literature, it should be recognized as a normal and frequent postoperative finding. Radiologists should be aware of this finding so that it is not mistaken for postoperative abnormalities following esophagomyotomy or an epiphrenic diverticulum.  相似文献   
92.
Joslyn  JN; Mirvis  SE; Markowitz  B 《Radiology》1988,166(3):817-821
During a 20-month period, fractures of the clivus occurring after craniocerebral trauma were diagnosed with computed tomography (CT) in 11 patients. Five patients had longitudinally oriented fractures; these were fatal in four patients due to either vertebral-basilar artery occlusion, brain stem trauma, or both. Six other patients had transversely oriented fractures that extended through the carotid canal and petrous temporal bone. While less frequently contributing directly to mortality, transverse fractures were also associated with cerebrospinal fluid leaks (two patients) and a cavernous sinus-carotid fistula (one patient). They were not as frequently associated with Horner syndrome or cranial nerve deficits as suggested in the current literature. This retrospective evaluation reveals two distinct injury patterns that demonstrate a difference in related morbidity and mortality.  相似文献   
93.
94.
95.
96.
97.
Makrythanasis P, Moix I, Gimelli S, Fluss J, Aliferis K, Antonarakis SE, Morris MA, Béna F, Bottani A. De novo duplication of MECP2 in a girl with mental retardation and no obvious dysmorphic features. Loss‐of‐function mutations of MECP2 are responsible for Rett syndrome (RTT), an X‐linked neurodevelopmental disorder affecting mainly girls. The availability of MECP2 testing has led to the identification of such mutations in girls with atypical RTT features and the recognition of milder forms. Furthermore, duplication of the entire gene has recently been described in boys with mental retardation and recurrent infections. We describe a girl with a heterozygous de novo MECP2 duplication. The patient, at the age of 19, has mental retardation with no autistic features. She is friendly but gets frequently anxious. She has neither dysmorphic features nor malformations. Her motor development was delayed with walking at 20 months. Speech is fluid with good pronunciation but is simple and repetitive. Diagnosis was made after single‐strand conformation analysis (SSCA) and multiplex ligation‐dependent probe amplification (MLPA) analysis of MECP2. Array comparative genomic hybridization (aCGH) analysis showed a duplication of 29 kb including MECP2 and part of IRAK1. Fluorescent in situ hybridization (FISH) has revealed that the duplicated region is inserted near the telomere of the short arm of chromosome 10. X‐chromosome inactivation in leukocyte DNA was not skewed. We conclude that it is likely that this MECP2 duplication is responsible for the mental retardation in this patient. This case broadens the phenotypic spectrum of MECP2 abnormalities with consequent implication in diagnosis and genetic counselling of girls with non‐syndromic mental retardation.  相似文献   
98.
Between 1996 and 2000, 90 newly diagnosed adult patients with T-acute lymphoblastic leukemia (T-ALL) were registered in the Gruppo Italiano Malattie Ematologiche dell'Adulto (GIMEMA) Leucemia Acuta Limfoide (LAL) 0496 protocol. Cases were centrally processed for morphology, immunophenotype, cytogenetics, molecular biology, and multidrug resistance (MDR). Twenty-two patients were females and 68 were males. Four percent of cases were pro-T, 47% pre-T, 39% cortical T, and 10% mature T-ALL. Fifty-six percent of patients with pro-T + pre-T-ALL achieved complete remission (CR) compared with 91% for cortical + mature cases (P = .002). CD34 expression was associated with a significantly lower CR rate: 54% versus 84% (P = .009). Thirty-one (36.5%) of 85 patients had an abnormal karyotype, the most common abnormality (15%) being a partial del(6q). The cytogenetic profile did not impact on CR achievement. MDR1 function, present in 26% of cases, correlated significantly with CR achievement (P = .004). A highly significant (P = .001) difference in CR rate was observed between patients who did not express the CD13/CD33/CD34 antigens and were MDR functionally negative (96%) compared with patients positive for at least one of these markers (57%). Multivariate analysis showed an impact on CR achievement for CD33 expression and MDR1 function. An extensive biologic workup of adult T-ALL cases at presentation is recommended in order to design tailored therapeutic strategies aimed at improving CR rates.  相似文献   
99.

Objectives

The aim of this study was to appreciate the safety and effectiveness of transradial percutaneous coronary intervention (PCI) with rotational atherectomy for highly calcified left main coronary artery (LMCA) disease in octogenarians.

Background

Conventional surgery is still considered the preferred management for LMCA disease; but, when the lesion is severely calcified, and the patient is unsuitable for surgery, the interventional cardiologist faces a complex PCI traditionally approached by femoral access.

Methods

Between June 2004 and December 2010, octogenarians with calcified LMCA disease who were primary denied for surgical revascularization were enrolled. Procedural success and major adverse cerebral and cardiovascular events (MACCE) including death, nonfatal myocardial infarction, target lesion revascularization (TLR), or stroke during long‐term follow‐up were evaluated.

Results

Forty‐two consecutive patients≥80 years had undergone stenting for calcified LMCA disease (13 with rotational atherectomy, the “Rota” group, and 29 without rotational atherectomy, the “without Rota” group). Procedural success was good (92.3% vs. 96.6%, respectively, p = NS). Mean follow‐up time was 25.7 ± 21.4 and 28 ± 32.3 months, respectively. There was a TLR in 25% and 11.1%, respectively; p = NS. No difference was detected in terms of overall in‐hospital or long‐term mortality or MACCE.

Conclusion

Rotational atherectomy followed by stent implantation by transradial approach, when applied to heavily calcified lesions, appeared to be a safe and effective strategy for the treatment of LMCA disease in octogenarians who were refused for surgery. (J Interven Cardiol 2013;26:173–182)
  相似文献   
100.
The presence of Visceral Larva Migrans (VLM) in a patient is reported. A 57-year- old woman suffering from right upper abdominal and suprapubic pain referred into a clinic in Khorramabad, Lorestan Province, Iran. A cystoscopy was performed and biopsy was taken. The light microscopic study showed a couple of larvae as well as mononuclear inflammatory cell- infiltration. Because occurrence of VLM is potentially problem in rural areas, it is recommended that an educational program to be initiated to prevent and control VLM infection in both rural and urban people. Clinicians also should consider the clinical features of visceral larva migrans.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号